diff --git a/core-java-modules/core-java-collections-3/pom.xml b/core-java-modules/core-java-collections-3/pom.xml index bd991bfefa..b206cd61d2 100644 --- a/core-java-modules/core-java-collections-3/pom.xml +++ b/core-java-modules/core-java-collections-3/pom.xml @@ -27,6 +27,11 @@ ${assertj.version} test + + org.apache.commons + commons-lang3 + 3.10 + diff --git a/core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/convertarrayprimitives/ConvertPrimitivesArrayToList.java b/core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/convertarrayprimitives/ConvertPrimitivesArrayToList.java new file mode 100644 index 0000000000..f7be99abdc --- /dev/null +++ b/core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/convertarrayprimitives/ConvertPrimitivesArrayToList.java @@ -0,0 +1,47 @@ +package com.baeldung.collections.iterators; + +import java.util.List; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.stream.Collectors; +import java.util.stream.IntStream; +import com.google.common.primitives.Ints; +import org.apache.commons.lang3.ArrayUtils; + +public class ConvertPrimitivesArrayToList { + + public static void failConvert() { + int[] input = new int[]{1,2,3,4}; + // List inputAsList = Arrays.asList(input); + } + + public static List iterateConvert(int[] input) { + List output = new ArrayList(); + for (int value : input) { + output.add(value); + } + return output; + } + + public static List streamConvert(int[] input) { + List output = Arrays.stream(input).boxed().collect(Collectors.toList()); + return output; + } + + public static List streamConvertIntStream(int[] input) { + List output = IntStream.of(input).boxed().collect(Collectors.toList()); + return output; + } + + public static List guavaConvert(int[] input) { + List output = Ints.asList(input); + return output; + } + + public static List apacheCommonConvert(int[] input) { + Integer[] outputBoxed = ArrayUtils.toObject(input); + List output = Arrays.asList(outputBoxed); + return output; + } + +} diff --git a/core-java-modules/core-java-collections-3/src/test/java/com/baeldung/collections/convertarrayprimitives/ConvertPrimitivesArrayToListUnitTest.java b/core-java-modules/core-java-collections-3/src/test/java/com/baeldung/collections/convertarrayprimitives/ConvertPrimitivesArrayToListUnitTest.java new file mode 100644 index 0000000000..b773baf7d8 --- /dev/null +++ b/core-java-modules/core-java-collections-3/src/test/java/com/baeldung/collections/convertarrayprimitives/ConvertPrimitivesArrayToListUnitTest.java @@ -0,0 +1,38 @@ +package com.baeldung.collections.iterators; + +import java.util.List; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.stream.Collectors; +import com.google.common.primitives.Ints; +import org.junit.Test; + +import static org.junit.Assert.assertEquals; + +public class ConvertPrimitivesArrayToListUnitTest { + + @Test + public void givenArrayWithPrimitives_whenIterativeConvert_thenArrayGetsConverted() { + assertEquals(Arrays.asList(1,2,3,4), ConvertPrimitivesArrayToList.iterateConvert(new int[]{1,2,3,4})); + } + + @Test + public void givenArrayWithPrimitives_whenStreamConvert_thenArrayGetsConverted() { + assertEquals(Arrays.asList(1,2,3,4), ConvertPrimitivesArrayToList.streamConvert(new int[]{1,2,3,4})); + } + + @Test + public void givenArrayWithPrimitives_whenIntStreamConvert_thenArrayGetsConverted() { + assertEquals(Arrays.asList(1,2,3,4), ConvertPrimitivesArrayToList.streamConvertIntStream(new int[]{1,2,3,4})); + } + + @Test + public void givenArrayWithPrimitives_whenGuavaConvert_thenArrayGetsConverted() { + assertEquals(Arrays.asList(1,2,3,4), ConvertPrimitivesArrayToList.guavaConvert(new int[]{1,2,3,4})); + } + + @Test + public void givenArrayWithPrimitives_whenApacheCommonConvert_thenArrayGetsConverted() { + assertEquals(Arrays.asList(1,2,3,4), ConvertPrimitivesArrayToList.apacheCommonConvert(new int[]{1,2,3,4})); + } +}